App Dev Worksheet: Input, Processing, Output

App development lesson 7: Input, processing and output · Set 228 · 40 questions

Developer's tip (In, work, out): Input → processing → output. Input: typing, tapping, a photo, your voice. Output: a result on screen, a sound, a buzz, a pop-up. In code, the processing line works out a new value from the inputs; show() is the output.

1. 1.⚙️ In an app, is working out a tip an input, processing or an output? (a) output (b) processing (c) input
2. 2.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 216; // typed by the user
   line 2: let friends = 4; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 3 (b) line 1 (c) line 2 (d) line 4
3. 3.⚙️ What number does this app show?
   let bill = 360; // typed by the user
   let friends = 5; // typed by the user
   let share = bill / friends;
   show(share);
4. 4.True or false: tapping a button is an output. (a) False (b) True
5. 5.True or false: tapping a button is processing. (a) True (b) False
6. 6.🔍 Which is the odd one out? (a) working out a tip (b) tapping a button (c) speaking a command (d) typing your age
7. 7.⚙️ Which line does the processing (works out the answer)?
   line 1: let bill = 110; // typed by the user
   line 2: let friends = 5; // typed by the user
   line 3: let share = bill / friends;
   line 4: show(share); (a) line 3 (b) line 4 (c) line 1 (d) line 2
8. 8.True or false: typing your age is an input. (a) True (b) False
9. 9.⚙️ What number does this app show?
   let price = 380; // typed by the user
   let off = 50; // typed by the user
   let pay = price - off;
   show(pay);
10. 10.Which of these is an output? (a) taking a photo (b) adding up a bill (c) checking a password (d) a beep sound
11. 11.True or false: a result on screen is an output. (a) True (b) False
12. 12.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 225; // typed by the user
    line 2: let friends = 5; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 3 (c) line 2 (d) line 1
13. 13.Which of these is an output? (a) typing your age (b) speaking a command (c) checking a password (d) a buzz (vibration)
14. 14.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 2; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
15. 15.Which of these is an output? (a) taking a photo (b) a result on screen (c) tapping a button (d) checking a password
16. 16.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 90; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 1 (b) line 4 (c) line 2 (d) line 3
17. 17.True or false: adding up a bill is processing. (a) False (b) True
18. 18.Which of these is processing? (a) typing your age (b) tapping a button (c) sorting the scores (d) taking a photo
19. 19.🔍 Which is the odd one out? (a) speaking a command (b) a beep sound (c) a result on screen (d) a buzz (vibration)
20. 20.⚙️ In an app, is sorting the scores an input, processing or an output? (a) processing (b) output (c) input
21. 21.⚙️ What number does this app show?
    let bill = 90; // typed by the user
    let friends = 3; // typed by the user
    let share = bill / friends;
    show(share);
22. 22.🔍 Which is the odd one out? (a) tapping a button (b) typing your age (c) taking a photo (d) sorting the scores
23. 23.True or false: adding up a bill is an output. (a) False (b) True
24. 24.Which of these is an output? (a) working out a tip (b) a pop-up message (c) taking a photo (d) checking a password
25. 25.⚙️ In an app, is a pop-up message an input, processing or an output? (a) input (b) output (c) processing
26. 26.True or false: typing your age is processing. (a) True (b) False
27. 27.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 9; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 2 (c) line 3
28. 28.⚙️ Which line does the processing (works out the answer)?
    line 1: let price = 15; // typed by the user
    line 2: let qty = 6; // typed by the user
    line 3: let total = price * qty;
    line 4: show(total); (a) line 2 (b) line 4 (c) line 1 (d) line 3
29. 29.🔍 Which is the odd one out? (a) speaking a command (b) taking a photo (c) a buzz (vibration) (d) tapping a button
30. 30.⚙️ In an app, is taking a photo an input, processing or an output? (a) output (b) input (c) processing
31. 31.⚙️ In an app, is tapping a button an input, processing or an output? (a) output (b) input (c) processing
32. 32.⚙️ What number does this app show?
    let price = 130; // typed by the user
    let off = 50; // typed by the user
    let pay = price - off;
    show(pay);
33. 33.Which of these is an input? (a) a result on screen (b) a beep sound (c) taking a photo (d) checking a password
34. 34.True or false: a pop-up message is an output. (a) False (b) True
35. 35.⚙️ Which line does the processing (works out the answer)?
    line 1: let bill = 180; // typed by the user
    line 2: let friends = 3; // typed by the user
    line 3: let share = bill / friends;
    line 4: show(share); (a) line 4 (b) line 2 (c) line 3 (d) line 1
36. 36.⚙️ What number does this app show?
    let price = 65; // typed by the user
    let qty = 3; // typed by the user
    let total = price * qty;
    show(total);
37. 37.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 15; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
38. 38.⚙️ What number does this app show?
    let km = 12; // typed by the user
    let metres = km * 1000;
    show(metres);
39. 39.⚙️ Which line does the processing (works out the answer)?
    line 1: let km = 3; // typed by the user
    line 2: let metres = km * 1000;
    line 3: show(metres); (a) line 1 (b) line 3 (c) line 2
40. 40.⚙️ What number does this app show?
    let price = 75; // typed by the user
    let qty = 2; // typed by the user
    let total = price * qty;
    show(total);

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